Telephone-transmitter.



L GOTTSCHALK, TELEPHONE TRANSMITTER. APPLICATION FILED .TA'N. 29 1910.

Patented Dec. 6,1910.

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, mm-Wok) WITNESSES! I F. GOTTSGHALK. TELEPHONE TRANSMITTER. Q, APPLICATION FILED JAN. 29,1910.

, Patented 1m 6, 1910. v

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' .AZTORNEK UNITED STATES? -j FELIXGOTTSCHAL'K, on, NEW YoRK, Y. 1

To all whom'itmcy concern." i

Be it known that I, FELIX GOTTSCHALK, a

citizen of the United States of America, and,

residentv of New York, in the county of New York and State of New York, have invented certain; new and useful Iniprovementsfin TelephoneTransmitters, of which the following is a full, clear, and exact description. The invention relates to improvements in telephonic instruments which are applicable on transmitters and also receivers of the Bell type now in very extensive use, and also wardly fiaring mouthpiece which constitutes a collector of germs, "dust, moisture and otherf'impurities, is done away with and.

in electric instruments in other types.

One of the objectsis to so construct and mount the diaphragm at the front of the instrument that the usually employed :1 forwhereby the front of the instrument is .closed, with the resultant advantage that canfind entrance into the interior of the in r Stlllmlll; to impair the operation thereof.

neither moisture, dust, or any-fine particles The instrumentv is, under the exercise of this invention, one. which is entirely sanitary with, furthermore, the. susceptibility of bemg always somaintained.

Further objects of the' inventionjare to improvethe operative. character of the diaphragm' and the efficiency of the same in its coiiperation'withi the-resistance cup includ-- ing-the usual. electrodesrand interposed granular carbon and to render it practicable toadjust and maintain the instrument in adjustment and to generally simplify the transmitteng' The invent-io'nconsists in the combination or arrangement of parts and the-construe tions of-certain of the parts. substantially as hereinafter described in conjunction with the accompanying drawings andset forth in the claims,

In .the drawings Figure 1 is substan-.

'tially a centralvertical sectional view, onan from front to rear through the improved telephone transmitter; Figi'2 -'is a view at the rear of the instrument, on a somewhat smaller ,scale than Fig. ,1,-the

inclosing casing being understood' as.v removed. Figs. '3 and 4 are partial central vertical sectional y ew's, on an enlarged scale,

Specification of Letters E atent.

' Patented a. o,.191o.*

showing constructions which whilesomewhatmodified from those represented in Fig; 1 are under and'inaccordancewi'th this invent on. FIg'S 5 and6 are respectively: a rear faceview and a cross section of the applicant filed January 29, 191 0. Serial No. 54o,747'.-REiS 1 "diaphragm of thef-form represented in :Figi

3, while Figs. 7 and 8 are respectivelya. f

rear face view and a central'cross section of the form of the --diaphragm-represented in l or similar characters I of refer encedenote the same or resembling partsin the several views.

H as: More especially referring to Fig; I: In

the drawings, A represents a metallic casing of the transmitter having a portion for section A; and the 's'aidczising, in-the section A tl1ereof,-is provided with a forwardly extending annular rib I) provided circular aperture a through the separable annular casing circumferentially inthe rear portion thereof.- it

casing, the portion of tli diaphrag'n near' I c ,its margin extending across the front'edge of the aforeinehtioned rib. f and has the rear .wardly turned portion 9 embracing and B ireprese'ntsthe diawith screw threads (Z and having a rabbeted more or less closely fitting the rabbe'tedpor tion fv of the rib' and having anou'tt u'rnedff marginal portion C represents a 'confining and tensioi'nng'ring internally screw 7 threaded in its rearward portion andha ving an intermediate annular shoulder i which engages the outturned marginal-portion of the diaphragm. By screwing the ring Cinore orless far ina rearward direction on the screw threadedann'ular rib whichi margins and extends forwardly from the aperture through the front ofthe tele-' phone casing,'tlie-thin metal diaphragm may'be drawntaut and maintained under a most desirable degree of tension for a maxi; inumof efiiciency: i'nthe vibratory action of I the-uniformly strained or stretched diavphragm; The diaphragm has a member F supported at its rear side and unitary therewith which rearwardly extends to contact or engagement with the front electrode in comprised as usualin the resistance cup G.

. the electrode.

- wardly. projecting from the front electrode,

' and the nut m screwing on the said stud, having its location between the rear of the diaphragm and the front face of the hub j servesto insure a contacting, with the required degree of delicacy of the rearwardly extending member orshbstantially inte ral appurtenance- F of the'diaphragm against K As represented in- Figs. 3, 5 and6, the member Fv formed as one with, and rearwardly extended from, the drum head diaphragm-is made in the form of a comparatively deep cone which is rearwardly divergent, and, by its oblated or truncated ingstem g fitted through portion at its rear end which is formed with an aperture, is engaged over the stud k which projects forwardly beyond the front electrode 00 of the resistance cup." In Fig. 3 the out-turned portion In of' the diaphragm is engaged-by the ring C whichinstead of screw engaging'the apertured front part A ofthecasing is connected thereto by the binding screws 0 0. Asrepresented in Figs. 4, 7 and 8, the .drum head diaphra m B has its rearwardly located substantialiy integral member F made in the form of a comparatively shallow sheet metal spider, the apertured'central portion of which has, a screw engage ment with the stud 7c forwardly projecting from the front electrode of the resistance cup ;it being possible by reason of the bodily adjustment of the resistance cup in a 'forward and rearward direction to secure 'the screw engagement of the appurtenance F of the diaphragm with the screw stud is, which, to all intents and purposes, in this instance is a part of the front electrode as.

The resistance cup, as represented in Figs. 1 and 2, has its rearwardly projectan insulating bushing r in the bridge and held in its adjusted confinement by the binding screw 8. The screw engagement between the rearwardly' located member F of the diaphragm B and the screw stud or the electrode having been efi'ected and the diaphragm tensioned on the forwardly projecting rib b of 'theapertured casing, it is entirely practicable to secure the adjustment of the inthe .rear' central strument to accord with the pro rly positioned and tensioned diaphragm y moving the resistance cup forwardly and rearwardly' through the insulating bushing piece 1" at portion of the brid e. Inasmuch as the diaphragm is in metal ic the diaphra contactwith the metallic casing A, A it is expedient in this improved telephone to have the telephone wire y in metallic connection by the extension wire with the metallic stem 9 of the resistance cup understood as in communication with the rear electrode instead of, as heretofore most usual, having such wire y in connection with the'front electrode on account of the frontelectrode being in metallic connection with the casing.

In the representation of the diaphragm, F ig. 4, the means for its supporting engagement with, and' for its tensioning on, the forwardly extending rib Z) of the casing section A consists in the rearwardly turned screw threaded portion 9 of the diaphragm and the externally screw threaded formations of the rib,the effect being that when the diaphragm is turned up so that its face -portion engages the front edge of the rib a then further rotative movement of the diaphragm will result in the straining or stretching of it to its suitably taut condition, owing to the more or less flexible'nature of the very thin spun-up or otherwise produced diaphragm having the screw threaded rib engaging flange.

The ring C, Fig. 1, or C Fig. 3, is represented as having a portion thereof provided so as to protrude forwardly beyond the plane of the diaphragm, such portion constituting a guard and protector to the diaphragm for saving it from becoming indented or distorted in case the telephone instrument should be overturned or fall accidentally.

The portion of the invention comprising the front aperture casing having a rib marginally ofits aperture in combination with m having a rearwardly turned and outwar 1 turned marginal portion and a ring applie on the said rib and engaging the outturned ortion of the diaphragm is as well applicagle on a telephone receiver as on a transmitter; and the employment thereof in either situation is to be considered within the scope of this invention.

It will be apparent from the foregoing description and the illustrations therewith provided that this instrument is one of extreme s im licity and economical construction, that it is absolutelyv closed at its front and possesses the advantage in addition to being entirely sanitary and germroof, of also excluding all moisture, dust an foreign matterfrom the interior of the casing; and yet the parts may be easily and quickly separated asany occasion for replacement or repair mayrequire.

In addition to making the casing ofthe instrument air and moisture tight at the front, the instrument is also rendered air and moisture tight at the rear by the prevision of a closure for the opening through- 'which the transmitterwire 3 leads into the casing.

4 The tubular bushing '10 in the rear of the casing is provided with a screw threaded outer end portion on' which an annular cap 10? is screwengaged, this cap having between its inner wall and the outer end of the bushing a rotary oroth'er compressible pack-f .mg ring w with the effect that the screwing of the cap more or less nearly home will compress the packing tightly about the terminal and exclude the entrance of air or moisture into the instrument at its rear.

I claim v 1. In a telephone transmitter, the combination with the casing, having an apertured front, and a resistance cup comprising a front electrode, of'a diaphragm, mounted 1n a stretched condit on between and con- 'nected with the portion of the casing marginally of its aperture, and provided at its rear side with a member, connected therewith between its vibratory center portion and its casing-engaging marginal portion, and which has a rearwardly converging formation and being, by its rear attenuated portion in contact with the front electrode. 2. In a telephone transmitter, in combi-, nation,- a casing, having a resistance-cup therewithin including afront electrode, and

said casing having a rib marginally of its, j

aperture, of a diaphragm spanningand completely vclosingtheaperture and extending across the edge of said-rib, a ring having a screw-engagement with said annular rib and operative to confine the diaphragm in a taut condition at the front; of the casing, and a member connected with and supported by the rear of the diaphragm between its center' and supported marginal portion and rearwardly extending therefrom to contact with the front electrode.-

3. In a telephone transmitter, in combination, a casing having aresistance cup therewithin including a front electrode. and said casing having a forwardlyextending annular rib marginally of its aperture, of :1. din phragm spanning the aperture and extending across the front edge of said rib, having a portion rearwardly turned to overlie the periphery of the rib, and having an outturned marginal portion, and a ring having a screw engagement with said annularrib andhaving a portion to engage the outturned portion of the diaphragm, and a member connected with and'supportedby the rear of the diaphragm, and in contact with the front electrode.

i. In a telephone transmitter, in combination, a casing, having a circular aperture through its front and provided marginally of said aperture with-,a forwardly extending annular rib provided circumferentiallyin the rear portion thereof with screw threads and having a rabbeted forward portion, adiaphragm spanning and closing the aperture n the casing extending across the front edge of said rib having the rearwardly turned portion embracing the rabbeted portion of the rib and having an outturned marginalport on, aconfimng and tensiomng ring 111- ternally screw-threaded in its rearward portion and having an intermediate annular shoulder engaging" the out-turned marginal portion of the diaphragm, and a resistance cup, mounted in the casing, including the front electrode with which the diaphragm has a vibratory coaction.

In telephone transmitter,the combination with a casing having a rib margined aperture through its frontand having therewithin a resistance cup including the front electrode, ofa diaphragm spanning and completely closing the casing aperture "'and' means for tautening the diaphragm in its engagement with the aperture-margnnngribv of the caslng, and said dlaphragm having a COulCZLl shell supported by and "connected to its rear side which rearwardly extends to contact with the front electrode,

and means for holding said member tosuch gaging marginal portion and having a rear-- wardly converging formation with an aperture in the rear portion thereof through which said stud loosely protrudes, and a nut screw engaged in'the stud for holding contact against the'front electrode.

7. The combination with the casing of a telephonic instrument having an aperture in its front, and constructed with a rib marglnally of said aperture. of a diaphragm spanning and completely inclosing said aperture and extending across the front edge of said rib having a portionrearwardly turned to overllc the periphery of the l'll) and having an outturued marginal portion and a ring on said annular rib and engaging the outturned portion ofthe diaphragm.

8. The combination with the casing of a telephonic instrument having an aperture in its front constructed with a rib imu-ginall'y of said aperture, of a diaphragm spanning and completely inrlosing said aperture. extending across the front edge of said rib.

having a portion rearwardl outlurned to i the rear portion of the apertured member in I overlie the periphery of the rib and having an outturned marginal portion, and an annular member screw engaging the casing and having a portion thereof in tensioning engagement against the said outturned portion of the diaphragm.

9. A diaphragm for a telephonic instrument consisting of thin metal of disk shape having the portion adjacent its margin rearwardly turned and having its extreme mar- 10 FELIX GOTTSCHALK.

Witnesses:

' J. J. LOCKWOOD, F. J. McAnAMs. 

